Factors influencing home range size and overlap in nonbreeding Kirtland’s Warblers on Eleuthera, The Bahamas

IF 1.4 4区环境科学与生态学 Q3 BIODIVERSITY CONSERVATION Avian Conservation and Ecology Pub Date : 2024-08-31 DOI:10.5751/ace-02709-190209

Jr. Joseph M. Wunderle, Michael E. Akresh, Dave Currie, Javier E. Mercado, Eileen H. Helmer, David N. Ewert

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Abstract

Knowledge of space use provides insight into a species’ habitat requirements needed for conservation. Little is known about space use of the near threatened Kirtland’s Warbler (Setophaga kirtlandii) wintering in The Bahamas, and how the warbler’s home range size and core area overlap among individuals and vary with sex and age, food availability, winter season, and habitat characteristics. To address these knowledge gaps, we used radio telemetry to determine sedentary home range size (95% adaptive kernel), core area (50% AK), and overlap for 27 radio-tagged warblers during two winters on Eleuthera, The Bahamas. Warblers monitored for ~3 weeks each had a median sedentary home range of 8.87 ha (range: 0.53–118.50 ha) and a median core area of 1.04 ha (range: 0.05–12.69 ha). Foliage of the warbler’s principal fruit species (Lantana involucrata, Erithalis fruticosa, Chiococca alba) was present in more warbler core area plots than in outlier plots (telemetry fix points outside the 95% AK home range) or in random plots within the landscape. Both size of home range and core areas increased with site disturbance age – consistent with declines in fruit abundance associated with age of vegetation. Warbler core areas displayed little pairwise overlap in two sites, “RS” and “MR,” examined during October–December (RS, x̄ = 1.49%; MR, x̄ = 0.55%) and at a site in January–February (MR, x̄ = 3.32%), indicating areas of exclusive use or territoriality. In contrast, a fruit-rich site (“OH”) in March–April had higher pairwise overlap in core areas (OH, x̄ = 8.56%), which may have resulted in competition for fruit. Our findings re-emphasize the importance of conservation at a landscape scale if spatiotemporal variation in food resources increases or become more concentrated prior to migration with extreme weather due to global climate change.

The post Factors influencing home range size and overlap in nonbreeding Kirtland’s Warblers on Eleuthera, The Bahamas first appeared on Avian Conservation and Ecology.

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影响巴哈马埃卢瑟拉岛非繁殖期柯特兰莺家园范围大小和重叠的因素

对空间利用的了解有助于深入了解保护物种所需的栖息地要求。我们对在巴哈马群岛越冬的近危物种基特兰莺（Setophaga kirtlandii）的空间利用知之甚少，也不知道基特兰莺的家园范围大小和核心区域在个体间如何重叠，以及如何随性别和年龄、食物可获得性、冬季和栖息地特征而变化。为了填补这些知识空白，我们在巴哈马群岛伊柳塞拉岛的两个冬季使用无线电遥测技术确定了 27 只无线电标记莺的定居家园范围大小（95% 适应性内核）、核心区域（50% AK）和重叠情况。每只被监测约 3 周的莺的中位定居家园范围为 8.87 公顷（范围：0.53-118.50 公顷），中位核心区面积为 1.04 公顷（范围：0.05-12.69 公顷）。莺的主要果实物种（Lantana involucrata、Erithalis fruticosa、Chiococca alba）叶片出现在莺核心区地块的数量多于离群地块（95% AK 家园范围外的遥测固定点）或景观内的随机地块。莺的家园范围和核心区的大小都随着受干扰地点的年龄而增加--这与植被年龄导致的果实丰度下降是一致的。在 10 月至 12 月考察的 "RS "和 "MR "两个地点（RS，x̄ = 1.49%；MR，x̄ = 0.55%）以及 1 月至 2 月考察的一个地点（MR，x̄ = 3.32%），莺的核心区域几乎没有成对重叠，这表明这些区域是莺的独占区域或领地。相比之下，3-4 月果实丰富的地点（"OH"）核心区域的成对重叠率更高（OH，x̄ = 8.56%），这可能是果实竞争的结果。我们的研究结果再次强调，如果食物资源的时空变化在迁徙前随着全球气候变化导致的极端天气而增加或变得更加集中，那么在景观尺度上进行保护的重要性。

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来源期刊

Avian Conservation and Ecology BIODIVERSITY CONSERVATION-ORNITHOLOGY

CiteScore

2.20

自引率

7.10%

发文量

审稿时长

>12 weeks

期刊介绍： Avian Conservation and Ecology is an open-access, fully electronic scientific journal, sponsored by the Society of Canadian Ornithologists and Birds Canada. We publish papers that are scientifically rigorous and relevant to the bird conservation community in a cost-effective electronic approach that makes them freely available to scientists and the public in real-time. ACE is a fully indexed ISSN journal that welcomes contributions from scientists all over the world. While the name of the journal implies a publication niche of conservation AND ecology, we think the theme of conservation THROUGH ecology provides a better sense of our purpose. As such, we are particularly interested in contributions that use a scientifically sound and rigorous approach to the achievement of avian conservation as revealed through insights into ecological principles and processes. Papers are expected to fall along a continuum of pure conservation and management at one end to more pure ecology at the other but our emphasis will be on those contributions with direct relevance to conservation objectives.